Add amtk (#4699)

* Add amtk

* change version

packages/amtk.rb

+require 'package'
+
+class Amtk < Package
+  description 'Actions, Menus and Toolbars Kit for GTK+ applications'
+  homepage 'https://wiki.gnome.org/Projects/Amtk'
+  version '5.2.0-33ec'
+  compatibility 'all'
+  source_url 'https://github.com/GNOME/amtk/archive/33ec171156ebc49d6dad568e6ba39470edb272e1.zip'
+  source_sha256 'fc9bad18bbd5421da52e0548f9e91eda180539bb568d1e7116ca65f4f73f4b67'
+
+  depends_on 'gtk3'
+  depends_on 'gobject_introspection' => ':build'
+  depends_on 'gtk_doc' => ':build'
+  depends_on 'llvm' => :build
+
+  ENV['CC'] = 'clang'
+  ENV['CXX'] = 'clang'
+
+  def self.build
+    system "meson #{CREW_MESON_OPTIONS} builddir"
+    system "meson configure builddir"
+    system "ninja -C builddir"
+  end
+
+  def self.install
+    system "DESTDIR=#{CREW_DEST_DIR} ninja -C builddir install"
+  end
+end